Dogs are notorious for consuming things that they should probably not eat. When this happens, it is important to take the necessary actions to ensure that the dog does not get any more sick than it already is. Inducing vomiting is one method of getting the substance out of the stomach. While it might seem dangerous to the dog, it is advantageous in most cases; however, if the bottle of the chemical that the dog has consumed says, "do not induce vomiting," it is important not to. If you are unsure, contact your veterinarian.

First Steps

If the dog has consumed a chemical or food that is toxic for the dog, or if it has eaten a toy that could do physical damage to the the animal, it is important to get it out of the system. Call up the vet and ask what to do. If the vet suggests inducing vomiting, immediately go about doing it. However, if the vet wants you to bring the dog in to do it, the vet is more qualified to do any procedure. If the dog is already vomiting, it is dangerous to induce more vomiting because it could cause dehydration for the pet. Furthermore, if the pet has consumed a chemical that is dangerous to vomit (bleach, human pain killers, etc.), taking the dog to the vet and using IVs (intravenous fluids) and sodium bicarbonate is suggested because these chemicals coming up with vomiting would cause damage to the esophagus.

Inducing Vomiting in Dogs

If vomiting becomes the choice of action, go to the medicine cabinet and get the hydrogen peroxide. It typically comes in a brown bottle. Using a dropper, fill up the syringe with 3 CCs per 20 lbs of the dog. A 40 lb dog would get 6 CCs. Open the dog's mouth slightly and depress the plunger so that the hydrogen peroxide hits the back of the dog's throat. Because it hits the back of the dog's throat, it will immediately swallow it. Wait about 10 minutes and the dog should begin vomiting. If the dog does not begin vomiting, repeat the same dosage. The dog might need more than others, so a second dosage is acceptable. However, if the dog does not vomit after two dosages, bring the dog to the vet. Always call the vet, though, before inducing vomiting to ensure that it is safe for the dog. You might think you know what is safe for the dog, but in the end, the vet has years of training to back up these decisions.

Source:

Dog First Aid 101: Induce Vomiting Only When It's Necessary, and Safe

petplace.com: How to Induce Vomiting in Dogs

The Daily Puppy: Inducing Vomiting in Dogs